Big Rig and His Big Birthday Surprise - my stories for children

Story 1. 

(I wrote these stories for my son in one of many nights when he did not want to go to sleep before the back massage and a story)

Very far away from our moon shines a small blue planet. And on this small planet there is a big city built by the big trucks.
They have big rigs, bulldozers, tow trucks, concrete mixers, damp trucks, mini loaders, delivery trucks, mail trucks and many other trucks. 
All the trucks have names and they are all good friends.  They work and play games together and have a lot of fun.
One day Big Rig decided to surprise his best friend, a Tow Truck.
Big Rig knew that more than anything on their planet Tow Truck liked ice-cream and for a very good surprise Big Rig decided to buy a lot of ice-cream.

“I want to buy a lot of ice cream!” -  Big Rig asked Ice – Cream Truck.
“Are you going to eat all the ice cream now?” - Ice Cream Truck was very surprised.
“No, I am buying this ice-cream for my best friend Tow Truck! He lives far away and I will visit him tonight.”
“How are you going to carry this ice cream?  You need a big freezer or at least a small fridge.”
“No, no, no. I don’t need a big freezer. I am a big truck, I can carry anything,” - Big Rig said proudly.
“Yes, but you need a freezer for ice-cream.”
“Oh, no, my truck is good enough.  Now I want a trunk full of your best ice-cream.”
“Okay, Big Rig, I will give you my best ice-cream!”
Ice-Cream Truck was laughing until he started to honk non –stop. Then he loaded all his ice–cream in the big truck.
Big Rig was driving fast to his friend the Tow Truck.
He was singing his favorite “Mister Moon Song” and thinking how much the Tow Truck will be happy to eat all the ice-cream:
“Mister Moon

On the sky

So high.
Mister Moon so
High on the sky.
All I want
Have two wings
To fly
And kiss Mister Moon
Good night!
Mister Moon
Good night!
Have a lovely,
Lovely, lovely night.
I will see
You again
Tomorrow night.
Good night,
Mister Moon
Good night!
All I want
Have two wings
To fly!”

When Big Rig finally drove to Tow Truck’s garage, he said:
“Open the doors! I have a big birthday surprise for you.”
Then he asked Tow Truck call all big and small two trucks, because it will be a big surprise for everyone too.
When all the tow trucks looked in the Big Rig’s trunk they were very surprised:
“Big Rig, why did you buy so much milk? We have never seen cookie, banana, strawberry and orange milk! Wow!”
All the ice-cream has melted!
Now Big Rig has to plan again a big birthday surprise for his best friend Tow Truck!

What would it be this time?